McDonald and the late Grady McWhiney presented the "Celtic hypothesis" stating that the distinctiveness of Southern culture derives largely from the majority of the Southern population being descendants of Celtic herdsmen while the majority of the Northern population was the descendants of farmers.
He founded the Grady McWhiney Research Foundation, located in Abilene, Texas.
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McWhiney and Forrest McDonald were the authors of the "Celtic Thesis," which holds that most Southerners were of Celtic ancestry (as opposed to Anglo-Saxon), and that all groups he declared to be "Celtic" (Scots-Irish, Irish, Scottish, Welsh and Cornish) were descended from warlike herdsmen, in contrast to the peaceful farmers who predominated in England.
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